短时傅立叶变换matlab仿真程序Word下载.docx
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短时傅立叶变换matlab仿真程序Word下载.docx
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fN=8000;
n=10000;
t=0:
1/fN:
(n-1)/fN;
Generatesignals<
sig1=sin(2*pi*500*t);
sig2=sin(2*pi*1000*t)/2;
puls=zeros(size(t));
puls(2100)=10;
puls(2132)=10;
x=sig1+sig2+puls;
windowwidth<
win1=12.8*fN/1000;
%12.8ms102.4points
win2=6.4*fN/1000;
%6.4ms51.2points
win3=3.2*fN/1000;
%3.2ms25.6points
steppinglength<
stepping1=16;
stepping2=32;
stepping3=64;
nfftpoints<
nfft=min(256,length(x));
painting(TimeFrequencyAnalysis)<
%----->
1.Hammingwindows,differentwindowwidth<
-----------
figure
(1)
subplot(311);
specgram(x,nfft,fN,hanning(round(win3)));
xlabel('
time(ms)'
)
ylabel('
frequency(kHz)'
title('
STFTTime-FrequencyMap,Hammingwindows,windowwidth3.2ms'
subplot(312);
specgram(x,nfft,fN,hanning(round(win2)));
STFTTime-FrequencyMap,Hammingwindows,windowwidth6.4ms'
subplot(313);
specgram(x,nfft,fN,hanning(round(win1)));
STFTTime-FrequencyMap,Hammingwindows,windowwidth12.8ms'
%-------------------------------------
2.Gausswindow,differentwindowwidth<
figure
(2)
specgram(x,nfft,fN,gausswin(round(win3)));
STFTTime-FrequencyMap,Gausswindow,windowwidth3.2ms'
specgram(x,nfft,fN,gausswin(round(win2)));
STFTTime-FrequencyMap,Gausswindow,windowwidth6.4ms'
specgram(x,nfft,fN,gausswin(round(win1)));
STFTTime-FrequencyMap,Gausswindow,windowwidth12.8ms'
%---------------------------------------
%------>
3.Hammingwindows,differentsteppinglength<
figure(3)
specgram(x,nfft,fN,hanning(round(win1)),stepping1);
STFTTime-FrequencyMap,Hammingwindows,windowwidth12.8ms,steppinglength16'
specgram(x,nfft,fN,hanning(round(win1)),stepping2);
STFTTime-FrequencyMap,Hammingwindows,steppinglength32'
specgram(x,nfft,fN,hanning(round(win1)),stepping3);
STFTTime-FrequencyMap,Hammingwindows,windowwidth12.8ms,steppinglength64'
4.Gausswindow,differentsteppinglength<
figure(4)
specgram(x,nfft,fN,gausswin(round(win1)),16);
STFTTime-FrequencyMap,Gausswindow,windowwidth12.8ms,steppinglength16'
specgram(x,nfft,fN,gausswin(round(win1)),32);
STFTTime-FrequencyMap,Gausswindow,windowwidth12.8ms,steppinglength32'
specgram(x,nfft,fN,gausswin(round(win1)),64);
STFTTime-FrequencyMap,Gausswindow,windowwidth12.8ms,steppinglength64'
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- 傅立叶 变换 matlab 仿真 程序
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